I previously used an EMS GB-USB for Gameboy-related things, but have had various compatibility issues with the software (Win 10) and certain Mega Memories not recognising it. I read something about Prof Abrasive and decided to bite the bullet with his Drag N' Derp, despite the high price. I was not disappointed - this tool is bang on perfect and worth every penny. You literally plug it into anything with a USB hole and it shows up as a mass storage device, no software needed. Simply copy your .GB or .SAV files then plug it into a Gameboy or Gameboy Advance and it just works. It's one of those lovely things I wonder how I ever made do without.